Patent US4757187A successfully refreshed from Google Patents.
Patent US2922645A successfully refreshed from Google Patents.
US2922645A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sheet material lifting mechanism
Assignee: GAF Chemicals Corp
•
Filing: 1956-12-24
•
Granted: 1960-01-26
•
Expires: 1976-12-24
Abstract
No abstract record available.
Inventors
- 👤 Gordon K Hurlbut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 09:22
CPC Classifications
G; G03; G03B; G03B27/00; G03B27/32; G03B27/52; G03B27/62; G03B27/6207; G03B27/625; G03B27/02; G03B27/14; G03B27/18; G03B27/22
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
GB304461A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-25 | 1963-07-27 | 1964-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-25 | 1967-07-27 | 1968-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-25 | 1971-07-27 | 1972-01-26 | $7700.00 | Window Closed / Lapsed |